STUDIES ON THE MECHANISMS OF ALKALI-CARBONATE REACTION PART I. CHEMICAL REACTIONS

AN UNDERSTANDING OF THE MECHANISMS OF ALKALI-CARBONATE ROCK REACTION WHICH RESULT IN EXPANSION OF CONCRETE IS OF PRIMARY IMPORTANCE IN DEALING WITH THE RESULTANT PROBLEMS ON A PRACTICAL LEVEL. THIS PAPER REPORTS RESULTS OF LABORATORY STUDIES MADE TO DETERMINE THE CONTRIBUTORY CHEMICAL REACTIONS THAT MAY TAKE PLACE. RESULTS OF PARALLEL STUDIES ON SUCH PHYSICAL ASPECTS AS INTERNAL STRUCTURE OF AND ACCESS OF ALKALIES INTO VARIOUS CARBONATE ROCK TYPES ARE NOT INCLUDED, BUT WILL BE PUBLISHED AT A LATER DATE. THE METHOD OF APPROACH HAS BEEN TO CONSIDER EACH OF THE THREE MAJOR MINERALS OR GROUPS OF MINERALS THAT NORMALLY MAKE UP CARBONATE ROCKS; I.E., QUARTZ, CLAYS AND CARBONATES. THESE WERE INVESTIGATED THROUGH STUDIES OF PURE MINERALS, AS WELL AS REACTIVE AND NON-REACTIVE ROCKS, TO DETERMINE WHAT POSSIBLE ROLE EACH MIGHT PLAY IN OBSERVED EXPANSION IN THE COMPOSITE SYSTEM. THESE MAJOR CONSTITUENTS WERE ANALYZED AND MEASURED BY A VARIETY OF METHODS TO DETERMINE CHEMICAL COMPOSITION, PHASE COMPOSITION, AND VOLUME AND MASS OF THE MATERIALS BEFORE AND AFTER EXPOSURE TO SODIUM AND POTASSIUM HYDROXIDE SOLUTIONS. /MASS AND WEIGHT ARE USED INTERCHANGEABLY THROUGHOUT THIS PAPER./ EVIDENCES OF REACTIONS NOTED DURING THIS PORTION OF THE STUDY WERE THEN SOUGHT IN THIN SECTIONS, TEST PRISMS, AND IN AGGREGATE FROM LABORATORY AND FIELD CONCRETE. /AUTHOR/

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  • Authors:
    • Sherwood, W Cullen
    • Newlon Jr, Howard H
  • Publication Date: 1964

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 41-56
  • Monograph Title: Symposium on Alkali-Carbonate Rock Reactions
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228561
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:37AM